Re: [Vala] async method and delegate

[Luca Bruno <lethalman88 gmail com>]

On Tue, Jun 21, 2011 at 11:09:47AM -0700, Jim Nelson wrote:
> On Mon, Jun 20, 2011 at 6:27 PM, Nor Jaidi Tuah <norjaidi tuah ubd edu bn>wrote:
>
> > On Mon, 2011-06-20 at 17:37 -0700, Jim Nelson wrote:
> > > With async, the delegate *is* copied, you just don't see it in the
> > > Vala code.  With an async method, when the thread of execution yields,
> > > the state of the function at that point is stored (copied or ref'd) in
> > > a context structure.  When the thread of execution resumes later, the
> > > state is pulled back out and the function resumes.
> >
> > Has that any bearing on the bug I mentioned in
> > my earlier email?
> If you mean the warning about copying delegates being discouraged, then yes
> it has bearing -- the delegate is being copied inside the async function.
> That's my point, the warning is accurate, it's because async methods have
> certain side-effects that are not apparent in the code on the screen.  For
> another example of this, see
> https://bugzilla.gnome.org/show_bug.cgi?id=639054
>
> The problem regarding the closure I haven't looked into.

That bug is more complex. Instead, it can be partially solved for unowned
delegates if you report a bug.

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